/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file collisionSegment.h
 * @author drose
 * @date 2001-01-30
 */

#ifndef COLLISIONSEGMENT_H
#define COLLISIONSEGMENT_H

#include "pandabase.h"

#include "collisionSolid.h"

class LensNode;

/**
 * A finite line segment, with two specific endpoints but no thickness.  It's
 * similar to a CollisionRay, except it does not continue to infinity.
 *
 * It does have an ordering, from point A to point B. If more than a single
 * point of the segment is intersecting a solid, the reported intersection
 * point is generally the closest on the segment to point A.
 */
class EXPCL_PANDA_COLLIDE CollisionSegment : public CollisionSolid {
PUBLISHED:
  INLINE CollisionSegment();
  INLINE explicit CollisionSegment(const LPoint3 &a, const LPoint3 &db);
  INLINE explicit CollisionSegment(PN_stdfloat ax, PN_stdfloat ay, PN_stdfloat az,
                                   PN_stdfloat bx, PN_stdfloat by, PN_stdfloat bz);

  virtual LPoint3 get_collision_origin() const;

public:
  INLINE CollisionSegment(const CollisionSegment &copy);
  virtual CollisionSolid *make_copy();

  virtual PT(CollisionEntry)
  test_intersection(const CollisionEntry &entry) const;

  virtual void xform(const LMatrix4 &mat);

  virtual void output(std::ostream &out) const;

PUBLISHED:
  INLINE void set_point_a(const LPoint3 &a);
  INLINE void set_point_a(PN_stdfloat x, PN_stdfloat y, PN_stdfloat z);
  INLINE const LPoint3 &get_point_a() const;

  INLINE void set_point_b(const LPoint3 &b);
  INLINE void set_point_b(PN_stdfloat x, PN_stdfloat y, PN_stdfloat z);
  INLINE const LPoint3 &get_point_b() const;

  bool set_from_lens(LensNode *camera, const LPoint2 &point);
  INLINE bool set_from_lens(LensNode *camera, PN_stdfloat px, PN_stdfloat py);

PUBLISHED:
  MAKE_PROPERTY(point_a, get_point_a, set_point_a);
  MAKE_PROPERTY(point_b, get_point_b, set_point_b);

protected:
  virtual PT(BoundingVolume) compute_internal_bounds() const;

protected:
  virtual void fill_viz_geom();

private:
  LPoint3 _a, _b;

public:
  static void register_with_read_factory();
  virtual void write_datagram(BamWriter *manager, Datagram &dg);

protected:
  static TypedWritable *make_from_bam(const FactoryParams &params);
  void fillin(DatagramIterator &scan, BamReader *manager);

public:
  static TypeHandle get_class_type() {
    return _type_handle;
  }
  static void init_type() {
    CollisionSolid::init_type();
    register_type(_type_handle, "CollisionSegment",
                  CollisionSolid::get_class_type());
  }
  virtual TypeHandle get_type() const {
    return get_class_type();
  }
  virtual TypeHandle force_init_type() {init_type(); return get_class_type();}

private:
  static TypeHandle _type_handle;
};

#include "collisionSegment.I"

#endif